How Much Does a Good Robot Lawn Mower Cost: Prices From €100 in 2026

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What you really need to decide

Almost everyone starts by looking at prices and ends up buying the wrong thing. The right order is the reverse: first decide how you're going to use it and how often, and only then look at models. Once that's clear, three or four specs are enough to rule out 80% of the catalog. This guide is exactly about that: which data points matter, which are just marketing, and how to translate them into a concrete buying decision.

The rain sensor isn't always worth turning on

Cutting wet grass muddies the housing, mats the clippings and leaves wheel marks. But if the robot takes shelter every time it rains in high-rainfall areas, it falls behind schedule and patches of grass grow too tall to trim in a single pass. In rainy climates, the usual strategy is disable the sensor and clean more often.

The PIN code and GPS lock are real anti-theft protection

Robots sit out in plain view in the garden and are an easy target. The good ones require PIN to operate, they lock themselves if they leave their geofenced area, and some send a phone alert if they're picked up. Without that, a robot in an unfenced garden is a risky buy, and it's worth keeping the serial number somewhere safe so you can report it if stolen.

The narrow passage is where most installations fail

Robots need a minimum width to maneuver: below about 60-80 cm between obstacles, they can't get through or get stuck. A garden split into two zones connected by a 50 cm passage forces you to carry the robot by hand or install a second base. It's the detail that causes the most disappointment, and it takes five minutes to check before buying.

Lithium batteries last longer when stored partially charged

At the end of the season, the battery shouldn't be stored at 100% or empty: the right level is around 50-60%, in a dry, frost-free spot, and topping up the charge halfway through winter if the robot will sit idle for months. Storing a lithium battery fully discharged all winter is the most effective way to kill it.

• Build quality and finish
• Recent verified reviews (including 3-4 star ratings)
• Warranty and return policy
• Current price versus its historical average
• Seller reputation
• Making sure the key features match your needs (Everyday Use)

The perimeter wire can be buried or staked down, and it makes a difference

Stapled to the surface, it's quick to install and the grass covers it within three weeks, but it stays exposed to scarifiers, hoes, and dogs. Buried 3-5 cm deep with a trimmer or a fine hoe makes it invulnerable. And at corners you need to respect the minimum radius specified by the manufacturer, because a sharp angle causes erratic readings.

Criteria	Gardena SILENO City 500Our pick	Mammotion Luba 2 AWD
Ideal for	Balanced, all-round use	Everyday Life
Strength	Value for money	Specific features
Ratings	Very positive and numerous	Positive
Estimated price	from ~€320	from ~€200
Recommendation	Our pick	Best alternative
View on Amazon	See price →	See price →

The robot lawn mower isn't cutting — it's wearing down the grass every day

A traditional mower cuts several centimeters at once every two weeks. The robot trims about millimeters each day, so the clippings are fine enough to break down right on the lawn and act as fertilizer: it's mulching continuous. That's why there's no bag to empty, and why a robot-mowed lawn tends to be denser and greener than a hand-mowed one.

Perimeter wire, RTK, and vision: three different ways of knowing where

The perimeter wire buried wire is reliable and cheap, but it has to be installed and can be cut by a hoe. The RTK-GNSS uses a fixed reference antenna and delivers centimeter-level accuracy without a wire, but it needs clear sky: under dense canopy it loses signal. The systems that camera-based vision don't need an antenna and work under trees, but they struggle in low light and with poorly defined edges.

Glossary: the terms you'll see in the spec sheets

Mulching

Very frequent, very short cuts: the clippings end up so fine that they decompose into the soil and act as fertilizer. That's why a robot mower doesn't have a collection bag.

Perimeter wire

A low-voltage wire that marks out the working area. Reliable and affordable; it's pinned to the surface or buried 3-5 cm deep, where it's protected from hoes and scarifiers.

RTK-GNSS

Satellite positioning with a fixed reference antenna that delivers centimeter-level precision with no cable. Needs clear sky; loses signal under dense tree canopy.

Pivoting blade

A small scalpel-type blade that cuts through speed and folds back when it hits an obstacle. Very cheap to replace; swapped out every 6-10 weeks of use.

The one-third rule

Never remove more than a third of the blade height in a single cut. More aggressive cuts stress the grass and favor weed growth.

Lift Sensor

A detector that stops the blade within milliseconds when the robot is lifted off the ground. Along with the tilt sensor and emergency stop, it's the minimum safety standard you should expect.

Charging base

Docking station. It needs level ground, a straight approach of several meters, no pooling water, and ideally some shade; a poorly placed one causes constant docking failures.

Conclusion: the decision in three steps

In short: define your actual use case, focus on the two or three specs that really affect it, and set your budget accordingly. With that filter, the Gardena SILENO City 500 is the default choice and the Mammotion Luba 2 AWD is the alternative when your priorities are different. Everything else — extra features, promotions, high-end models — is secondary once those three steps are sorted.

Frequently Asked Questions

Could it be stolen from my garden?

It's a real risk. Look for a mandatory PIN, geofenced locking and a phone alert when it's picked up. Keep the serial number somewhere safe. In an open, visible garden, those features stop being a nice-to-have.

How many square meters does a robot actually cover?

Considerably less than what the box says if your garden is irregular. The stated figure assumes long working days and a clear surface. With trees, flower beds and narrow passages, allow a 30% margin over your measured area.

Can it mow when it's raining?

It can, but it muddies the housing and leaves wheel marks. In very rainy climates it's usually best to disable the rain sensor and clean more often, because if the robot takes shelter too much, tall grass builds up that it can no longer trim in a single pass.

How often should the blades be replaced?

Pivoting blades, every 6-10 weeks of use or sooner if you notice the grass looking frayed instead of cut. They're very cheap, and replacing them is the maintenance task that makes the biggest visible difference to your lawn. Replace them all at once so the disc stays balanced.

What height should I mow at?

Never remove more than a third of the blade height at once. In summer, raise the cutting height to shade the soil and retain moisture; in spring you can lower it. A robot fixed at 2 cm in the middle of August will scorch the lawn.

Should I Go With the Gardena SILENO City 500 or the Mammotion Luba 2 AWD?

The Gardena SILENO City 500 is the most balanced option and the one we recommend by default. The Mammotion Luba 2 AWD makes sense if your priority is Everyday Use. As a budget reference, the useful range starts around €200 and the best balance tends to sit around €320.

By the Robot Jardín Team · reviewed by

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